If you bought Doom3 like me, through steam, and you pc is dual boot like mine.

Start steam on Windows, go to your library, right click on the Doom 3 icon, and click show cd key.If you bought roe too, same thing.

Then you can use those keys on you Linux install.

It would have been allot easier, if I just could have done this, through steam.Notice the link you put in the command line, but officially they don't support Linux.Some of the tools are released though, that why that link is their.